diff options
Diffstat (limited to 'include/linux/gpio/driver.h')
| -rw-r--r-- | include/linux/gpio/driver.h | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 01497910f023..95a51794c24a 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -227,9 +227,13 @@ struct gpio_irq_chip { * @reg_dat: data (in) register for generic GPIO * @reg_set: output set register (out=high) for generic GPIO * @reg_clr: output clear register (out=low) for generic GPIO - * @reg_dir: direction setting register for generic GPIO + * @reg_dir_out: direction out setting register for generic GPIO + * @reg_dir_in: direction in setting register for generic GPIO * @bgpio_dir_inverted: indicates that the direction register is inverted - * (gpiolib private state variable) + * (gpiolib private state variable) this means @reg_dir_in is + * available but not @reg_dir_out. + * @bgpio_dir_unreadable: indicates that the direction register(s) cannot + * be read and we need to rely on out internal state tracking. * @bgpio_bits: number of register bits used for a generic GPIO i.e. * <register width> * 8 * @bgpio_lock: used to lock chip->bgpio_data. Also, this is needed to keep @@ -237,7 +241,8 @@ struct gpio_irq_chip { * @bgpio_data: shadowed data register for generic GPIO to clear/set bits * safely. * @bgpio_dir: shadowed direction register for generic GPIO to clear/set - * direction safely. + * direction safely. A "1" in this word means the line is set as + * output. * * A gpio_chip can help platforms abstract various sources of GPIOs so * they can all be accessed through a common programing interface. @@ -298,8 +303,10 @@ struct gpio_chip { void __iomem *reg_dat; void __iomem *reg_set; void __iomem *reg_clr; - void __iomem *reg_dir; + void __iomem *reg_dir_out; + void __iomem *reg_dir_in; bool bgpio_dir_inverted; + bool bgpio_dir_unreadable; int bgpio_bits; spinlock_t bgpio_lock; unsigned long bgpio_data; |